We have tried a couple of combinations of the hacker series, first we used the sport speedie and a 6 turn, very impressive power but not quite smooth enough, tried an 8 turn and was better, then we got hold of the comp speedie with 6 it is awesome, probably too much power depending on grip and track size. if i were to buy again i would go comp speedie, and a 7 turn motor so it is a tad smoother.
I have raced against novaks, and the hacker has them hands down in all respects other than midd throttle smoothness. I would say for a small tight track and low grip go the novak, for big high traction tracks the hacker will kill the novak.
Dont know about lhner, too many combinations, and no info so i stayed away.
12th Scale - The premier class (if you can make runtime)